I had 1/2" black pipe from the regulator to the appliances (stove, furnace, water heater). I then had a shutoff, then 3/8 flexpipe to the hookup. I'm redoing the whole bus and this is something I want to do right.

Question is do you think this is too large a pipe for the feed line? Should I use 3/8" pipe, or will it be fine as is?

I couldn't quite follow the tracing of your path. But it is suggested that you have an electric solenoid shutoff near the tank. So you'd have the tank, the tank valve, then the solenoid valve, the regulator, then the line into the coach. I only have two appliances that are propane-the stove and furnace that are right next to each other with the propane tank directly below for the shortest pipe run with a switch from inside to control the flow of propane into the bus. Personally don't like propane-have seen too many times what a tank of propane can do to a motorhome. Good Luck, TomC

Len,Just a safty issue.The state code here in NJ,now States that Black Iron Pipe can omly be used for warm water applications, such as low preassure/high preassure boilers.It's not allowed here for gas pipe anymore. Only galvinized pipe is allowed. There is too much moisture in propane and Nat Gas and the enviroment thatthe black pipe will be in stalled [in the bays] may be subjected to moisture and corrode the black iron.Nick-

Nick, I thought that propane or nat gas would cause the galvinized to flake off Here in Illinois i believe the rule is black pipe only. All of the homes i have seen have been black iron pipe, and so were my motorhomes. So what is true? Just wondering. Black iron gets rusty inside so it's a no no for any water, people have been changing to pvc or copper for water. No disrespect for New Jersey laws or you intended.

Pete

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WHAT EVER YOU DO, OR TO WHO YOU DO IT TOO, DO IT WITH A SMILE, IT MAKES IT LEGAL THAT WAY.

As I recall, California insisted on black pipe for natural gas. I had to remove the copper line I used to install a bathroom heater and replace it with black pipe. Galvanized was absolutely a no-no also. Richard

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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body. But rather to skid in sideways, chocolate in one hand, a good Reisling in the other, body thoroughly used up, totally worn out and screaming: WOO HOO, what a ride

I would prefer to make a manifold out of 1/2" black iron pipe with individual shut off valves and a home run out of 3/8' copper tubing to each individual appliance.

What about using corrugated stainless steel tubing instead of copper tubing?

In my mind, copper doesn't seem like the best idea for propane in a RV since the vibrations can crack it. Many RVs do use soft copper, but the RVIA standards are very lax and RV makers usually cheap out and do the bare minimum.

Black pipe is the code in Maryland outside. We can use copper or Gastite inside. We used to use copper outside but the dope addicts would steal it to sell. My personal advice was to shoot the dopers instead of changing the piping but it was against regulations. LOL